<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
	<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
	<title>盒子</title>
	<style type="text/css">
        .box_top{width: 300px; height: 300px; background: yellow url() 0 0 no-repeat;}
        
	</style>
</head>
<body>
	<div class="box_top">
	</div>
</body>
</html>